Abstract
1. 1. The activity of low K m-aldehyde dehydrogenase (ALDH) in the liver mitochondrial fraction (MT-fraction) from male C57BL/6J strain mice (alcohol preferring) was significantly higher than that from DBA/2 mice (alcohol avoiding). The F 1 hybrids (C57BL/6J × DBA, 2) did not exhibit the intermediate activity to these two strains. 2. 2. Strain differences in liver mitochondrial ALDH isozymcs were observed by isoelectric focusing. C57BL/6J strain had two isozymes at pH 7.1 while DBA/2 had no band at this pH. F 1 hybrid mice had similar two bands with lower density to those of C57BL/6J at pH 7.1. There was no difference in zymograms of the soluble fraction between C57BL/6J and DBA/2 strains. 3. 3. The present results suggest that the difference in alcohol preference of mice may depend on some restricted ALDH isozymes with different pI or electric mobility rather than the enzymatic activity in the liver MT-fraction.
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